A.He doesn't like to prepare food for the club members. B.He isn't careful when he's preparing food. C.He often fills the kitchen with tomato and chocolate. D.He cooks for the club members quite often.
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【单选题】操作中的精馏塔,保持F,x F ,q,D不变,若采用的回流比R< Rmin,则x w _____。